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proddy
2020-07-16 22:35:51 +02:00
parent 36ad77511f
commit 0305c207d7
2 changed files with 102 additions and 102 deletions
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168
lib/framework/FSPersistence.h
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@@ -6,93 +6,93 @@
template <class T>
class FSPersistence {
public:
FSPersistence(JsonStateReader<T> stateReader,
JsonStateUpdater<T> stateUpdater,
StatefulService<T> * statefulService,
FS * fs,
char const * filePath,
size_t bufferSize = DEFAULT_BUFFER_SIZE)
: _stateReader(stateReader)
, _stateUpdater(stateUpdater)
, _statefulService(statefulService)
, _fs(fs)
, _filePath(filePath)
, _bufferSize(bufferSize)
, _updateHandlerId(0) {
enableUpdateHandler();
}
public:
FSPersistence(JsonStateReader<T> stateReader,
JsonStateUpdater<T> stateUpdater,
StatefulService<T>* statefulService,
FS* fs,
char const* filePath,
size_t bufferSize = DEFAULT_BUFFER_SIZE) :
_stateReader(stateReader),
_stateUpdater(stateUpdater),
_statefulService(statefulService),
_fs(fs),
_filePath(filePath),
_bufferSize(bufferSize),
_updateHandlerId(0) {
enableUpdateHandler();
}
void readFromFS() {
File settingsFile = _fs->open(_filePath, "r");
void readFromFS() {
File settingsFile = _fs->open(_filePath, "r");
if (settingsFile) {
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
DeserializationError error = deserializeJson(jsonDocument, settingsFile);
if (error == DeserializationError::Ok && jsonDocument.is<JsonObject>()) {
JsonObject jsonObject = jsonDocument.as<JsonObject>();
_statefulService->updateWithoutPropagation(jsonObject, _stateUpdater);
settingsFile.close();
return;
}
settingsFile.close();
}
// If we reach here we have not been successful in loading the config,
// hard-coded emergency defaults are now applied.
applyDefaults();
}
bool writeToFS() {
// create and populate a new json object
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
JsonObject jsonObject = jsonDocument.to<JsonObject>();
_statefulService->read(jsonObject, _stateReader);
// serialize it to filesystem
File settingsFile = _fs->open(_filePath, "w");
// failed to open file, return false
if (!settingsFile) {
return false;
}
// serialize the data to the file
serializeJson(jsonDocument, settingsFile);
settingsFile.close();
return true;
}
void disableUpdateHandler() {
if (_updateHandlerId) {
_statefulService->removeUpdateHandler(_updateHandlerId);
_updateHandlerId = 0;
}
}
void enableUpdateHandler() {
if (!_updateHandlerId) {
_updateHandlerId = _statefulService->addUpdateHandler([&](const String & originId) { writeToFS(); });
}
}
private:
JsonStateReader<T> _stateReader;
JsonStateUpdater<T> _stateUpdater;
StatefulService<T> * _statefulService;
FS * _fs;
char const * _filePath;
size_t _bufferSize;
update_handler_id_t _updateHandlerId;
protected:
// We assume the updater supplies sensible defaults if an empty object
// is supplied, this virtual function allows that to be changed.
virtual void applyDefaults() {
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
JsonObject jsonObject = jsonDocument.as<JsonObject>();
if (settingsFile) {
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
DeserializationError error = deserializeJson(jsonDocument, settingsFile);
if (error == DeserializationError::Ok && jsonDocument.is<JsonObject>()) {
JsonObject jsonObject = jsonDocument.as<JsonObject>();
_statefulService->updateWithoutPropagation(jsonObject, _stateUpdater);
settingsFile.close();
return;
}
settingsFile.close();
}
// If we reach here we have not been successful in loading the config,
// hard-coded emergency defaults are now applied.
applyDefaults();
}
bool writeToFS() {
// create and populate a new json object
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
JsonObject jsonObject = jsonDocument.to<JsonObject>();
_statefulService->read(jsonObject, _stateReader);
// serialize it to filesystem
File settingsFile = _fs->open(_filePath, "w");
// failed to open file, return false
if (!settingsFile) {
return false;
}
// serialize the data to the file
serializeJson(jsonDocument, settingsFile);
settingsFile.close();
return true;
}
void disableUpdateHandler() {
if (_updateHandlerId) {
_statefulService->removeUpdateHandler(_updateHandlerId);
_updateHandlerId = 0;
}
}
void enableUpdateHandler() {
if (!_updateHandlerId) {
_updateHandlerId = _statefulService->addUpdateHandler([&](const String& originId) { writeToFS(); });
}
}
private:
JsonStateReader<T> _stateReader;
JsonStateUpdater<T> _stateUpdater;
StatefulService<T>* _statefulService;
FS* _fs;
char const* _filePath;
size_t _bufferSize;
update_handler_id_t _updateHandlerId;
protected:
// We assume the updater supplies sensible defaults if an empty object
// is supplied, this virtual function allows that to be changed.
virtual void applyDefaults() {
DynamicJsonDocument jsonDocument = DynamicJsonDocument(_bufferSize);
JsonObject jsonObject = jsonDocument.as<JsonObject>();
_statefulService->updateWithoutPropagation(jsonObject, _stateUpdater);
}
};
#endif // end FSPersistence
#endif // end FSPersistence